Excitation of a transverse magnetic waveguide mode near cutoff in a free‐electron laser

1995 ◽  
Vol 2 (4) ◽  
pp. 1311-1315 ◽  
Author(s):  
Joseph E. Willett ◽  
Yildirim Aktas ◽  
Hassan Mehdian
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Waveguide Mode ◽  
Transverse Magnetic ◽  
Magnetic Waveguide

Coupling between different oscillation branches in a waveguide-mode free-electron laser

1991 ◽  
Vol 67 (7) ◽  
pp. 832-834 ◽  
Author(s):  
Y. Kawamura ◽  
B. C. Lee ◽  
M. Kawai ◽  
K. Toyoda
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Waveguide Mode

scholarly journals Hybrid (Oscillator-Amplifier) Free Electron Laser and New Proposals

2021 ◽  
Vol 11 (13) ◽  
pp. 5948
Author(s):  
Andrea Doria
Keyword(s):  
Electric Field ◽  
Free Electron ◽  
Free Electron Laser ◽  
Radiation Source ◽  
Far Infrared ◽  
Infrared Region ◽  
Transverse Magnetic ◽  
Radiation Emission ◽  
Magnetic Undulator ◽  
Strong Radiation

The present work analyses a hybrid free electron laser (FEL) scheme where the oscillator is based on a radiation source operating with a slow-wave guiding structure as, for instance, a Cerenkov FEL or a Smith–Purcell FEL. Such devices, often running in transverse magnetic (TM) modes, present a longitudinal electric field which can easily affect the longitudinal electrons’ velocities, inducing an energy modulation on the beam. Such a modulation, properly controlled, can induce a strong radiation emission in a magnetic undulator properly designed to operate as a radiator. General considerations will be exposed together with a practical numerical example in the far infrared region of the spectrum.

scholarly journals Spontaneous emission and small-signal gain of a low-.GAMMA., waveguide-mode free-electron laser operating in the low-gain Compton regime.

1990 ◽  
Vol 18 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Byung Cheol LEE ◽  
Yoshiyuki KAWAMURA ◽  
Koichi TOYODA ◽  
Masayuki KAWAI ◽  
Sang Soo LEE
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
Waveguide Mode ◽  
Small Signal Gain ◽  
Small Signal ◽  
Signal Gain

Design Study of a Table-Top THz Free-Electron Laser for Security Inspection

2010 ◽  
Vol 5 (4) ◽  
pp. 50-58
Author(s):  
Y. U. Jeong ◽  
G. M. Kazakevich ◽  
S. H. Park ◽  
K. Lee ◽  
J. Mun ◽  
...  
Keyword(s):  
Electron Beam ◽  
Real Time ◽  
Free Electron ◽  
Free Electron Laser ◽  
Waveguide Mode ◽  
High Gain ◽  
Radiation Losses ◽  
Security Inspection ◽  
Pic Code ◽  
Thz Power

We have designed a table-top terahertz (THz) free electron laser (FEL). The main issue of the FEL design is to decrease radiation losses at a FEL resonator except outcoupling ratio. Also reducing the number of undulator periods and total undulator length is important to increase FEL conversion efficiency and to reduce its size. The FEL consists of a magnetron-based microtron having an energy of ~5 MeV, a strong electromagnetic helical undulator having the period of ~25 mm, and a cylindrical waveguide-mode optical resonator. The total diameter of the microtron is approximately 50 cm and the macropulse current is more than 50 mA. The size of the system is expected to be 1x2 m2 . The condition for lowloss and high-gain oscillator of the table-top FEL has been studied by using a 2-D FEL code. Simple injection scheme of the electron beam to the undulator was optimized by calculating beam trajectories with a 3-D PIC code. The average THz power is calculated to be 1 W with the tunable wavelength range from 200 µm to 500 µm. The FEL is expected to be used for the real-time imaging of security inspection.

Sign in / Sign up

Export Citation Format

Share Document